This is really bad maths. Imagine diagonal of X cm. Imagine screen so tall and thin, that diagonal approaches vertical. Area is tiny. As you swing same diago

This is really bad maths. Imagine diagonal of X cm. Imagine screen so tall and thin, that diagonal approaches vertical. Area is tiny. As you swing same diagonal downwards, area increases. Till diagonal is 45% from horizontal. As you keep going, area begins to reduce, until, when diagonal is almost horizontal, area is tiny. Needing to get out more ...